Digital filtering circuit operable as a three-stage moving avera

Details Digital filtering circuit operable as a three-stage moving avera Digital filtering circuit operable as a three-stage moving avera

1994-02-15

1995-08-08

Envall, Jr., Roy N.

Boots, shoes, and leggings

36472401, 36472417, 36472416, 341143, G06F 1531, H03H 300

Patent

active

054405033

ABSTRACT:
In a digital filtering circuit for converting an input data signal (a) of a sampling frequency f.sub.s into an output data signal (OUT) of an oversampling frequency Nf.sub.s which is N times the sampling frequency f.sub.s. The digital filtering circuit comprises a combination of a calculating circuit (30), and first and second integrating circuits (40, 50). The first integrating circuit (40) integrates a calculated signal (d) in synchronism with the oversampling frequency Nf.sub.s to produce a first integration result signal (b) and a first delayed signal (e). The second integrating circuit (50) integrates the first delayed signal (e) in synchronism with the oversampling frequency Nf.sub.s to produce a second integration result signal (c) and a second delayed signal (f) as the output data signal (OUT). The calculating circuit (30) carries out a predetermined calculation on the input data signal (a), the first integration result signal (b), and the second integration result signal (c) in synchronism with the sampling frequency f.sub.s to produce the calculated signal (d). The predetermined calculation is represented by an equation as follows:

REFERENCES:
patent: 4193118 (1980-05-01), Nash et al.
patent: 4764967 (1988-08-01), Christopher
patent: 5191332 (1991-02-01), Shieu
patent: 5311181 (1993-05-01), Ferguson, Jr. et al.
James C. Candy et al., "A Voiceband Codec with Digital Filtering", IEEE Transactions on Communications, vol. COM-29, No. 6, Jun. 1981, pp. 815-830.

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